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@uiih tant @anni @Hire O'RE'N T'.' HAYES, or -HAsTilNesg4 MINNESOTA. 'Laim Pam: No. 61,539, ma January 29, 1567.

IMPRGVEMEN'I.' IN GARPENTERS" SQUARES.

'To ALL WHQM 1T MAY eoNoERN:

v vBeit known that I, OBEN T, HAYES, of Hastings, in the county of Dakota, and State of Minnesota, have invented a new and useful Improvement in Carpenter Squares i and I do hereby declare the following to be a full, clear, and exact description of the nature, construction, and operation of the same, sniicient to enable those skilled in the art to which my invention appertains to understand and use the same, referenee beinghad to the accompanyingdrawings, forming part of this specification, and in which the improvement is represented by aplan view.

The improvement consists in the provision, near the angle of the square, of 'a slotor slots, for the pivotal attachment of a plate or plates, which may be set at such an angle as may be required with the inner and outer edges ofthe square, for the purpose of laying oii' angles of work, mitres, or otherwise.

` In the drawings, Arepresents a portion of the square, having slotsla and m,'the central portion of Kthe former being described from the inner angle of the square, and the otherslot being described from the outer angle of the square, and having scales or graduatious marked against them, embracing ninety degrees. B is a plate, which is adjustably attached to the ,square'by means of the screw-bolt c and nut D, the bolt passing through a slot in the plate B, and securing it so that one of the edges d shall range with the inner angle g of the' square and with such markgon theV scale 4as ,shall be desired. It isjshown adjusted to make a mitre joint, or at forty-five degrees with the edges K K of the squares, but may be made to indicate any angle. The plate B is shown in red lines, attached by the slot m and the bolt, as before, to indicate angles and afford the means of ruling lines having any required angle with thie edges b b of Athe squares. The plate is shown Withits square end ranging with the line of thirty degrees, which would cause the edge d to form an angle of thirty degrees with the edge b', or of one hundred and twenty degrees with the edge b. The plate B may be attached by means of holes, orby the slot. The scales may be calculated for any specific kind of Work, as, for instance, laying off rafters where the rise varies from'one in four-to one in two, or less, and it is thought advisable to so arrange the opening near the, end of the plate B that the angle may agree with the point h as the plate is revolved around the latter as a centre. l

What I claim as new, and desire to secure by Letters Patent, is v A square, provided with agraduated scale of angles, and one or more curved slots at the intersection of its limbs, for the attachment of an adjustable plateB, applied and operating .substantially as 'and for the purpose specified. v I I To the abovespeciication of my, improvement` in carpenters" squares I have signed my hand-this 16th of July, 1866. l y

OBEN T. HAYES.

Witnesses:

EDWARD H. KNIGHT, JAMES L. EWIN. 

